Influence of counterion species on the dehydroxylation of Ca2+-, Mg2+-, Na+- And K+-exchanged Wyoming montmorillonite

H. J. Bray; S. A.T. Redfern

doi:10.1180/002646100549238

Influence of counterion species on the dehydroxylation of Ca²⁺-, Mg²⁺-, Na⁺- And K⁺-exchanged Wyoming montmorillonite

H. J. Bray, S. A.T. Redfern^*

^*Corresponding author for this work

University of Cambridge

Research output: Contribution to journal › Article › peer-review

45 Citations (Scopus)

Abstract

The dehydroxylation of Ca-, K-, Mg- and Na-saturated Wyoming montmorillonite has been studied by thermogravimetry (TG), infrared (IR) spectroscopy and X-ray diffraction (XRD). Samples saturated with either Ca²⁺ or Mg²⁺ show a predominantly diffusion-controlled reaction step, whereas Wyoming montmorillonite with Na+ and K+ in the interlayer exhibit control closer to first order. The activation energy of dehydroxylation is not significantly correlated to the type of interlayer cation present, in turn demonstrating that the role of vacancy location in the octahedral sheet is more significant a control on dehydroxylation.

Original language	English
Pages (from-to)	337-346
Number of pages	10
Journal	Mineralogical Magazine
Volume	64
Issue number	2
DOIs	https://doi.org/10.1180/002646100549238
Publication status	Published - 2000
Externally published	Yes

ASJC Scopus Subject Areas

Geochemistry and Petrology

Keywords

IR spectroscopy, X-ray diffraction, dehydroxylation kinetics
Montmorillonite

Access to Document

10.1180/002646100549238

Cite this

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abstract = "The dehydroxylation of Ca-, K-, Mg- and Na-saturated Wyoming montmorillonite has been studied by thermogravimetry (TG), infrared (IR) spectroscopy and X-ray diffraction (XRD). Samples saturated with either Ca2+ or Mg2+ show a predominantly diffusion-controlled reaction step, whereas Wyoming montmorillonite with Na+ and K+ in the interlayer exhibit control closer to first order. The activation energy of dehydroxylation is not significantly correlated to the type of interlayer cation present, in turn demonstrating that the role of vacancy location in the octahedral sheet is more significant a control on dehydroxylation.",

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AB - The dehydroxylation of Ca-, K-, Mg- and Na-saturated Wyoming montmorillonite has been studied by thermogravimetry (TG), infrared (IR) spectroscopy and X-ray diffraction (XRD). Samples saturated with either Ca2+ or Mg2+ show a predominantly diffusion-controlled reaction step, whereas Wyoming montmorillonite with Na+ and K+ in the interlayer exhibit control closer to first order. The activation energy of dehydroxylation is not significantly correlated to the type of interlayer cation present, in turn demonstrating that the role of vacancy location in the octahedral sheet is more significant a control on dehydroxylation.

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